Electric signaling apparatus.



J. I. GHEGAN.

ELECTRIC SIGNALING APPARATUS.

APPLICATION FILED APR. 12, 1911.

LQ75,903. Patented Aug. 13, 1918.

INVENTOR JOHN JOSEPH GHEGAN, OF EAST ORANGE, NEW JERSEY.

ELECTRIC SIGNALING APPARATUs.

Specification of Letters Patent. .Patentmd Aug. 13, 1918..

Application filed April 12, 191?. Serial no. 161,416.

To all whom it may concern:

Be it known that I, JOHN J osnrn GHEGAN, a citizen of the United States, and a resident of East Orange, in the county of Essex and State of New Jersey, have made certain new and useful Improvementsin Electric Signaling Apparatus, of which the following is a specification.

This invention relates to soundersfor use in Morse or code telegraph receiving stations, and the object is to provide a sounder that will operate on an alternating-current circuit, as, for instance, the sixty cycle alternating current commonly supplied for lighting and power purposes.

The sounder has a coil and preferably a magnetic core, the armature is pivoted to reciprocate through the polar field of such coil or magnet and to normally rest in a floating position at a point of maximum magnetic density; this is the normal closed circuit position. The armature reciprocates or has a to-and-fro motion with fixed adjustable stops, to limit the extent of movement; it also has a retractor, for this a quick-acting, helical spring is preferred. This spring is overpowered by the magnetism in the coil or magnet and under closed-circuit conditions the armature floats or rests, in a central posi tion where its free terminal or pole is coincident with the magnetic polar density point of the coil or magnet. When the current in the local circuit is broken or changed, the spring forces the armature or armature-bar to impact or sharply strike a blow on the clown-contact limit-stop and when the circuit is closed, the magnetism causes 1 the armature to sweep or pass through the polar field so that its momentum causes an impact with the opposite or up-contact stop; the armature instantly returning to an intermediate position, floats :at the point of maximum polar density while the local circuit is closed, and continues to respond to code signals, consisting of long and short impulses, as the Morse alphabet is transmltted over the main telegraph circuit.

In another application filed by me December 20, 1916, Serial No. 137,984, I have shown and described relays and Sounders adapted for use with alternating current in both main line and local circuits, and the present application shows and describes an improvement in structure of such a sounder.

In the drawings Fi re 1 shows an alternating current circuit, a main telegraph 7" having front and back contacts 10 and 11,

a vibrating armature 9, and a retractor 12. A transformer is shown at t, with a primary coil 29 and a secondary coil .9. This supplies li ht for the circuit 80 and also. local battery current for the local circuit 8 controlled by the circuit changer 9 of the relay r. The

sounder magnet at has a polar projection 14, an armature a on a bar pivoted at 5 with up and down contacts 6 and 7 a compression spring 21 is adjustable by means of the screw 20. As shown in Fig. 1, the local circuit Sis closed atlO and armature a, which, by reason of the separation between fixed contacts 6 and 7, is adapted to have a to-and fro movement through the polar field of magnet m, rests at the point of maximum polar density as shown. When circuit 0 is broken, armature 9 of relay 1 goes to its back contact 11, circuit 8 is broken, and spring 21 quickly forces the free terminal of the armature-bar into engagement with the upcontact 6 with a sharp impact; when circuit 0 is closed, armature 9 engages front contact 10, circuit 8 is closechmagnet m attracts its armature a against the power of spring 21, armature a sweeps through the polar field and its free terminal engages downcontact stop 7 with a sharp impact, armature a immediatel returning to an intermediate position as shown in Fig. 1. This described movement occurs when either a clot or a dash is transmitted, the difference in time closely following the excursion of the armature 9 of relay 9".

What I claim is:

1. In a Morse sounder the combination of an 'electromagnet, a pivotally supported armature adapted to reciprocate through the polar field, an armature bar, a retractor for said bar and up and down contact stops for said bar fixed in position to permit said armature and bar to reciprocate through the polar field, impact on the stop, and then take an intermediate position in the maximum polar field.

2. The combination in a Morse sounder for use in an alternating current local circuit of an electromagnet "an armature adapted to reciprocate through and across the point of maximum polar density, an armature bar therefor, a retractor for the armature and two limit stops fixed in position such that the armature under closed circuit conditions passes through the point of maximum polar density to an extent permitting the bar to impact on a stop and then return to an intermediate position, at the pointof maximum polar density. c

3. The combination in a telegraphic receiving instrument of an electro-magnet, a reciprocating armature contact, stops to determine the extent of mot-ion of said contact, a retractor for said contact, and means whereby said contact, under the momentum due to closing circuit in said magnet coil, moves through the polar field, lITlPLXCt'YS on one of said stops and instantly returns to an intermediateposition of maximum polar density in said field, out of engagement with either of said stops.

JOHN JOSEPH GHEGAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

